If you grit your teeth, you press your upper and lower teeth tightly together, usually because you are angry about something. [V n] ⇒ Gritting my teeth, I did my best to stifle one or two remarks. [V-ed] ⇒ 'It is clear that my client has been less than frank with me,' said his lawyer, through gritted teeth.

British English: gritVERBIf you grit your teeth, you press your upper and lower teeth tightly together, usually because you are angry about something.Gritting my teeth, I did my best to stifle one or two remarks.